Experimental Assessment of Ball Joints Operation Using Servo-Hydraulic Testing Systems

摘要

The paper reports experimental results from tests carried out at room temperature on servo-hydraulic system dedicated for examination of the operation properties of rocker arms. The ball joint of this element was modified by an application of composite coating such as the tungsten carbide (WC). To apply cyclic loading to rocker arms the griping system was designed and elaborated. Results from tests performed on the composite coated ball joints were compared with data obtained for typical elements. Variations of the following parameters versus time i.e. force, temperature, weight, diameters and surface topography of balls were analysed with respect to operation properties of the modified ball joints. An increase of the friction coefficient was achieved for sliding joints of the steel ball-steel cups coated by the WC.